linux-kernel - [PATCH] irqchip/gic-v3-its: Mark GIC as non-shareable by OF property

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Message-ID: <20230904020431.27057-1-fangxiang3@xiaomi.com>
Date:   Mon, 4 Sep 2023 10:04:31 +0800
From:   Fang Xiang <fangxiang3@...omi.com>
To:     <tglx@...utronix.de>, <maz@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <fangxiang3@...omi.com>
Subject: [PATCH] irqchip/gic-v3-its: Mark GIC as non-shareable by OF property

GIC600/GIC700 integration in some platforms does not support the
sharability feature. Commit a8707f553884 ("irqchip/gic-v3: Add
Rockchip 3588001 erratum workaround") added flags to indicate the
integration design error, but the quirk is just applied with
RK3588/RK3588S and GIC600.

The property are named "force-non-shareable" to be vendor agnostic,
since apparently similar integration design errors exist in other
platforms and they can reuse the same property in their GIC ITS
device-node.

Signed-off-by: Fang Xiang <fangxiang3@...omi.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index e0c2b10d154d..2e92eac1e5f3 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -5055,6 +5055,16 @@ static int __init its_compute_its_list_map(struct resource *res,
        return its_number;
 }

+static void its_of_update_shareability(struct its_node *its)
+{
+       if (!fwnode_property_present(its->fwnode_handle,
+                               "force-non-shareable"))
+               return;
+
+       its->flags |= ITS_FLAGS_FORCE_NON_SHAREABLE;
+       gic_rdists->flags |= RDIST_FLAGS_FORCE_NON_SHAREABLE;
+}
+
 static int __init its_probe_one(struct resource *res,
                                struct fwnode_handle *handle, int numa_node)
 {
@@ -5130,6 +5140,7 @@ static int __init its_probe_one(struct resource *res,
        its->msi_domain_flags = IRQ_DOMAIN_FLAG_ISOLATED_MSI;

        its_enable_quirks(its);
+       its_of_update_shareability(its);

        err = its_alloc_tables(its);
        if (err)
--
2.34.1

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